Using input multiplexing and output multiplexing technique on MPLAB to drive a PIC24 microcontroller.
In this laboratory, we are going to build a nearly-trivial application which will accept characters from the keypad and display them, two at a time, on the display. To reduce the number of digital I/O pins required, the keypad and display will be driven in a multiplexed manner.
the program should be able to do the following:
● Start with all segments off
● Every <30ms, rapidly stimulate in sequence all 4 lines of keypad while continuously reading and recording the column values, then decode those values to determine which key has been pressed.
● For every keypress, shift the rightmost displayed value to the left seven-segment digit (most significant), then display the key pressed on the rightmost digit(least significant).
● The display should be multiplexed and show both digits simultaneously (at least to the human eye).
